package artid.com.arttogoa.util;

import java.io.File;
import java.math.BigDecimal;

import android.content.Context;
import android.os.Environment;
/**
 * 
 *    
 * 类名称：DataCleanManager_Util   
 * 类描述：缓存管理-清除   
 * 创建人：耿卫斌  
 *
 */
public class DataCleanManager_Util {
	/**
	 * 获取缓存大小
	 * @param context
	 * @return
	 * @throws Exception
	 */
	public static String getTotalCacheSize(Context context) throws Exception {
		long cacheSize = getFolderSize(context.getCacheDir());
		if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {  
			cacheSize += getFolderSize(context.getExternalCacheDir());
		}  
		return getFormatSize(cacheSize);
	}

	/**
	 * 清除缓存
	 * @param context
	 */
	public static void clearAllCache(Context context) {
		deleteDir(context.getCacheDir());
		if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {  
			deleteDir(context.getExternalCacheDir());
		}  
	}

	private static boolean deleteDir(File dir) {
		if (dir != null && dir.isDirectory()) {
			String[] children = dir.list();
			for (int i = 0; i < children.length; i++) {
				boolean success = deleteDir(new File(dir, children[i]));
				if (!success) {
					return false;
				}
			}
		}
		return dir.delete();
	}

	// 获取文件  
	//Context.getExternalFilesDir() --> SDCard/Android/data/你的应用的包名/files/ 目录，一般放一些长时间保存的数据  
	//Context.getExternalCacheDir() --> SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据  
	public static long getFolderSize(File file) throws Exception {  
		long size = 0;  
		try {  
			File[] fileList = file.listFiles();  
			for (int i = 0; i < fileList.length; i++) {  
				// 如果下面还有文件  
				if (fileList[i].isDirectory()) {  
					size = size + getFolderSize(fileList[i]);  
				} else {  
					size = size + fileList[i].length();  
				}  
			}  
		} catch (Exception e) {  
			e.printStackTrace();  
		}  
		return size;  
	}  

	/** 
	 * 格式化单位 
	 *  
	 * @param size 
	 * @return 
	 */  
	public static String getFormatSize(double size) {  
		double kiloByte = size / 1024;  
		if (kiloByte < 1) {  
			//           return size + "Byte";  
			return "0K";
		}  

		double megaByte = kiloByte / 1024;  
		if (megaByte < 1) {  
			BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));  
			return result1.setScale(2, BigDecimal.ROUND_HALF_UP)  
					.toPlainString() + "KB";  
		}  

		double gigaByte = megaByte / 1024;  
		if (gigaByte < 1) {  
			BigDecimal result2 = new BigDecimal(Double.toString(megaByte));  
			return result2.setScale(2, BigDecimal.ROUND_HALF_UP)  
					.toPlainString() + "MB";  
		}  

		double teraBytes = gigaByte / 1024;  
		if (teraBytes < 1) {  
			BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));  
			return result3.setScale(2, BigDecimal.ROUND_HALF_UP)  
					.toPlainString() + "GB";  
		}  
		BigDecimal result4 = new BigDecimal(teraBytes);  
		return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()  
				+ "TB";  
	}  



}